Power-transmitting device.



A. SUNDH.

POWER TRANSMITTING DEVICE. APPLICATION FILED 00T. 24,1907.

Qg Patented Mar. 7', 191:1.

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AUGUST SUNDI-I, OF YONKERS, NEW YORK, ASSIGNOR TO O'IIS ELEVATORCOMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

POWER-TRANSMITTING DEVICE.

To all whom it may concern.'

Be it known that I, AUGUST Snrnrr, a citizen of the United States,residing in Yonkers, in the county of Vllestchester and State of NewYork, have invented a new and useful Improvement in Power-TransmittingDevices, of which the following isk a specification.

My invention relates to power transmitting devices, and moreparticularly to a combined chain and gear driving or power transmittingmechanism.

One of the objects of the invention is the provision of a constructioncombining a chain drive and a safety device operable upon the breakingof the chain.

Another object of the invention is to so combine a chain and gear driveas to secure the advantages of both, while at the same time avoidingobjectionable features incident to the use of either one alone.

Other objects will appear hereinafter, the novel combinations ofelements being set forth in the appended claims.

Referring to the accompanying drawing in which is illustrated aconstruction embodying my invention, Figure 1 is a plan view of suchconstruction; Fig. 2 is a crosssection of the interlocked gear wheel andsprocket wheel; Fig. 3 is an elevational view of the same; Fig. Je is across-section of the integral gear and sprocket wheel: Fig. 5 is afragmentary view of the sprocket wheel; and Fig. 6 is a diagrammaticview of an elevator to which my invention is shown applied.

In Fig. 1 is shown an electric motor M mounted on a base B and having adrive shaft S extended therefrom and journaled in bearings 1, 2 in theframe 3 secured to the base B. Keyed to t-he shaft S within the frame 3are a sprocket wheel i and a gear wheel 5, which are preferably made inone piece as shown in Fig. e, although they may be made separate andbolted or otherwise rigidly secured together. A driven shaft 6 isjournaled in the frame 3 parallel with the drive shaft S. Keyed to theshaft 6 is a sprocket wheel 7 in alinement with the drive sprocket wheelLl, and driven by the sprocket chain S which extends around the sprocketwheel. The chain is of the form known as a silent chain,beingpractically noiseless in its operation. The hub of the sprocket wheel 7is extended to form a bear- Speccation of Letters Patent.

Application Ied October 24, 1907.

Patented Mar.

serial N0. 398,967.

ing 9 on which is rotatably mounted a gear wheel 10, held againstremoval from the hub 9 by a ring 11 locked on the hub 9 by a set screw1Q. The sprocket wheel 7 is formed with a lug 13 which extends throughan arcshaped slot 1i in the gear wheel 10. The wheels 7 and 10 aresubstantially the same in diameter and have the same number of teeth ontheir peripheries. The drive gear and sprocket wheels 5 and il have alsoan equal number of teeth. The gear wheel 10 is driven from the drivegear 5 through an intermediate idler gear 15 which serves to change thedirection of rotation of the gear 10. A hoisting drum D is shown mountedon the shaft 6.

The mechanism as above described is arranged for use in a tractionelevator. As shown in Fig. 6 the hoisting cables 17 which are infrictional driving engagement with the drum D, extend upwardly therefromand over the overhead sheaves 18 and have secured to their opposite endsthe elevator car C and counterweight lV.

ln operation, the integral gear and sprocket wheels 5 and 4t will drivethe gear and sprocket wheels l0 and 7, respectively, in the samedirection and at the same speed. The sprocket wheel '7 being keyed tothe shaft 6, will rotate it and with it the hoist ing drum D. As the lug13 is located centrally in the slot 11- and the gear wheel 10 is looselymounted on the hub 9, no driving power is transmitted to the drum Dthrough the gear lwheel 10. The train of gears 10, simply rot-ate thegear wheel 10 at the same speed as the sprocket wheel 7, and maintainthe lug` 13 in its intermediate position in the slot 14. This relationof parts will be maintained during the normal operation of the device.lf, however, the chain S should give way, owing to overload, wear of thechain or other cause, the sprocket wheel l0 will no longer be driven bythe sprocket chains, but will fall back until the lug 13 engages the endof the slot 14. The sprocket wheel 7 will then be driven by the gearwheel 10, and all the driving power for the hoisting drum will betransmitted through the gear wheels.

This construction secures the advantage of the smooth ruiming andpractically noiseless chain drive, and does away with the greaterfriction and noise of the gear drive, which often become excessive asthe gears i are not weakened by wear.

wear, the noise being objectionable in elevator mechanism and otherplaces where the present invention might be applied. There being no loadon the gears, there is but little wear on them. At the same time, theadvantage of greater safety found in gear drives, owing to their greaterstrength, is also secured. This is greater than when the gear connectionalone is used, as the gears The sprocket chain or chains S may be maderemovable, so that the gear drive alone may be used if desired.

Although I have shown my invention applied to a traction elevator systemby way of illustration, and as also showing a practical applicationthereof, it is obviously adapted to a great variety of uses. It isespecially' useful wherever considerable power is to be transmitted andthe strength and safety of toothed gearing is desired without itsattendant noise and friction and wear. The shaft S may be driven fromany suitable source of power, and the shaft G may transmit power to adrum, pulley, countershaft, or other device.

Various changes in details of construction and arrangements of partsmight be made without departing from the spirit and scope of theinvention, and I wish therefore not to be limited to the exactconstruction disclosed.

l/vlhat I claim as new and desire to secure by Letters Patent of theUnited States is l. In a power-transmitting device, the combination of adriving element, a driven element, and a flexible member connecting saidelements, and normally inoperative driving means for limiting theindependent operation of said elements upon the disconnection of theflexible member and operating said elements at the same relative speedas said flexible member,

2, In a power-transmitting device, the combination of a drive wheel, adriven wheel, a connecting and power-transmitting element therebetween,and a second connecting and power transmitting element normallyinoperative and forming a means for limiting the independent rotation ofthe said wheels upon the disconnection of said element and operatingsaid wheels at the same relative speed as said first-named powertransmitting element.

3. In a power-transmitting device, the combination with sprocket wheels,of a driving chain connecting the wheels, and gearing between saidwheels ineffective while said chain is intact and forming means forlimiting the independent rotation of the wheels upon the disconnectionor giving way of the chain.

4. In a power-transmitting device, the combination of a drive wheel, adriven wheel, and a driving connection therebetween, and a seconddriving connection between said wheels normally inoperative and forminga means for limiting the independent rotation of the drive whe-el whensaid connection is broken and operative when said connection is brokento drive said wheels at the same relative speed as maintained by saidfirst-named driving connection.

In a power-transmitting device, the combination of a drive element, adriven element, and a driving connection therebetween, and normallyinoperative driving gearing forming means for confining the independentoperation of said elements within narrow limits upon the breaking ofsaid driving' connection and maintaining said elements at the samerelative speed as that maintained by said driving connection.

(i. In a power-transmitting device, the combination with a drive shaft,of a driven shaft, a driving connection therebetween, and a seconddriving connection between the shafts normally inoperative to transmitpower, but operable upon the breaking of said first connection to drivethe driven shaft at the same speed relative to the drive shaft as thatmaintained by the first-named driving connection.

7. In a power-transmitting device, the combination with a drive shaft,of a driven shaft, a sprocket wheel and chain connection therebetween, atrain of gears between the shafts, and automatic interlocking meansbetween said connection and said train of gears operable upon thebreaking of said first connection.

S. In a power-transmitting device, the combination with a drive shaftand a driven shaft, of a gear wheel connection, and a Y sprocket wheeland chain connection between the shafts, one of said connections beingoperable to transmit power only upon the breaking of the otherconnection.

9. In a power-transmitting device, the combination with a shaft, ofinterlocked wheels mounted on the shaft, one loosely and the other fixedthereto, and separate means for independently driving said wheels in thesame direction.

l0. In a power-transmitting device, the combination with a shaft, ofinterlocked wheels mounted on the shaft and having a limited independentrotative movement, a drive shaft, and driving connections between eachof said wheels and the drive shaft for independently driving saidwheels.

1l. In a power transmitting device, the combination of a rotary drivingelement, a sprocket wheel, a chain transmitting power between saidsprocket wheel and the driving element, a train of gears comprising agear rotatableY with the driving element and a gear having the same axisof rotation as said sprocket wheel, and means independent of the saidchain for limiting the relative rotation of said last-named gear andsaid sprocket wheel.

12. In a power-transmitting device, the combination with a shaft, of asprocket wheel keyed thereto, a gear wheel rotatably mounted on theshaft, means for limiting the rotary movement of the gear wheel on theshaft, a sprocket chain on the sprocket wheel, a pinion in mesh with thegear wheel, and means for operating said chain and pinion to drive thegear wheel and sprocket wheel at the same angular velocity.

13. In a power-transmitting device, the combination with a shaft, and awheel keyed thereto for rotation therewith, of a second wheel rotatablymounted on the shaft, means for limiting the rotary movement of saidsecond wheel, and means for simultaneously rotating said wheels at theSame angular velocity and with said second wheel in an intermediaterotary position on the shaft.

let. In a power-transmitting device, the combination .with a drive shaftand a driven shaft, ot sprocket wheels keyed to said shafts, a sprocketchain connecting the wheels, a gear wheel rotatively mounted on thedriven shaft, means to limit the rotary movement of the gear wheel onthe shaft, a gear wheel secured to the drive shaft, an idler pinionconnecting said gear wheels, and means for driving the drive shaft, saidgear wheels and sprocket wheels being proportioned to give the wheels onthe driven shaft the same angular velocity when the drive shaft isrotated.

15. In a power-transmitting device, the combination with a shaft, ot' awheel iXed on the shaft, a wheel rotatively mountedI on the shaft, oneof said wheels being formed with a slot therein, a lug formed on theother wheel and projecting through the slot to limit the rotary movementof the second named wheel, and means for simultaneously rotating thewheels independently ot each other at the same angular velocity and withthe lug in an intermediate position in the slot.

16. In a power-transmitting device, the combination with a drive shaft,of a sprocket wheel and a gear wheel keyed thereto, a

driven shaft, a sprocket wheel keyed thereto, a drive chain connectingthe sprocket Wheels, a gear wheel journaled on the hub of the sprocketwheel on the driven shaft, said gear wheel being provided with a slot, alug formed on the adjacent sprocket wheel and projecting into the slot,said slot and lug being of a size to permit a limited movement of thegear wheel on its shaft, an idler pinion between the gear wheels and inmesh therewith, means for rotating the drive shaft, and a deviceoperated by the driven shaft.

l?. The combination with a drive element of a driven element, andcombined chain drive and gear drive connections each extending trom oneto the other of said elements and independently operable to operate thedriven elementin the same direction relativo to the drive element.

18. The combination with a driving element, of a driven element, asprocket and chain driving connection between said ele ments, and a gearconnection between said elements operative only when the sprocket andchain connection is inoperative said connections both eiiecting theoperation of the driven element in the same direction relatively to thedriving element.

19. The combination with a drive element of a driven element, sprocketwheel and chain driving connection between said elements, and means toprevent independent movement beyond narrow limits of said elements whensaid connection is broken.

20. The combination with a drive shaft, of a driven shaft, a. gear wheeland a sprocket wheel keyed to the drive shaft, a sprocket wheel keyed`to the driven shaft, a gear wheel mounted on the driven shaft andhaving limited rotative movement thereon, a sprocket chain connectingthe sprocket wheels, and an idler pinion connecting the gear wheels.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

' AUGUST SUNDH.

Witnesses:

CHAS. M. Nissan, ALFRED C. BECHET.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents. Washington, D. C.

